linux-kernel - Re: Perf and ftrace [was Re: PyTimechart]

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Message-ID: <1273690878.1626.165.camel@laptop>
Date:	Wed, 12 May 2010 21:01:18 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Pierre Tardy <tardyp@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, arjan@...radead.org,
	ziga.mahkovec@...il.com, davem <davem@...emloft.net>
Subject: Re: Perf and ftrace [was Re: PyTimechart]

On Wed, 2010-05-12 at 14:51 -0400, Mathieu Desnoyers wrote:
> 
> It makes it hard to use splice() or read() if you don't specify the buffer size
> at creation time. That alone seems like a pretty good argument for fixing the
> size before the mmap() call. 

Our read() doesn't actually provide the same data splice()/mmap() would.
But yeah, hence my proposal to create a separate syscall that creates
buffer objects.

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